What is a drag brake? I remember back in the day brakes were never an issue, to stop the rear wheel was locked and fishtailing,never used a coaster brake enough to see if it had any fade resistance, the construction was rather simple with brass or bronze"stopper thingys" The steeper the hill the better( more terminal velocity) perhaps God makes exceptions for Low IQ, youth,DA and sometimes drunks.wow ok then. They could have put on coaster brakes too right? maybe a drag brake? the companies do what will sell their bikes that's the whole point.
the guy has problem brakes and your going on that the bike should have come with oddball brakes. ya they could have put mechanical brakes on but they chose not too. Now he has to replace them with hydraulic brakes because thats how the bike is built. I recommended those pads because they cost less then Shimano pads and last longer. but you have to go on about car brake pads. I get it your cheap and you love to try to rub it in. Myself I don't buy the best but I also don't by unknown product when my life is on the line. Guess what others worry about their quality of brakes too. it just seems mail order e bikes don't have them. just like cheap bikes at Walmart and such.
OTH I do like the idea of the hydraulic caliper for the simple reason of both pads working simultanously. You do not suppose that the OP accidentally pulled a lever with a wheel off? If the seal was bypassed it may have never had a chance to reseat correctly. I am on OP's side though,I consider sub $4000 high priced.